TOPIC: CISCO 2801 dropping packets

I'm new to CISCO networking and have been given the task to
setup a VPN to one of our business partners. The VPN tunnel is working but all traffic over the tunnel seems to lose packets. When I do a ping to an IP at the other end from a workstation in our network I typically see about 50% dropped packets. When I do the same ping from the 2801 I do not get a single dropped packet.

The workstation has IP 10.147.93.2 and i'm trying to ping 10.135.172.49. Below is the current running-config.